7224 BM bearing
120 × 215 mm · dynamic rating 165 kN · static rating 163 kN. Dimensions, load ratings, designation meaning, life estimates and equivalent parts.
7224 BM specification
| Designation | 7224 BM |
| Type | Single-row angular contact ball bearing |
| Series | 72 light |
| Bore diameter d | 120 mm |
| Outside diameter D | 215 mm |
| Basic dynamic load rating C | 165 kN (165,000 N) |
| Basic static load rating C0 | 163 kN (163,000 N) |
| Ratio C0/C | 0.99 |
| Speed guide, grease lubrication | 4,000 rpm |
| Life exponent p | 3 (ball bearing) |
Values come from the Rotec AI bearing catalogue and are indicative. Confirm against the manufacturer's current catalogue before ordering. Not every dimension (such as width) is listed here.
What the designation 7224 BM means
| Code | Meaning |
|---|---|
| 72 | Angular contact ball bearing, light dimension series |
| 24 | bore code "24" = 24 × 5 = 120 mm |
| B | 40° contact angle |
Basic rating life of the 7224 BM
Basic rating life is L10 = (C / P)p million revolutions, where P is the equivalent dynamic load and p = 3 (ball bearing). For a 7224 BM with C = 165 kN, the table shows what that gives at different load levels. It is the ISO 281 basic life only: it does not include lubrication, contamination, misalignment or reliability modifiers.
| C / P | P as share of C | L10 (million rev) | L10 at 1,500 rpm | L10 at 3,000 rpm |
|---|---|---|---|---|
| 3 | 33.3% | 27 | 300 | 150 |
| 5 | 20.0% | 125 | 1,400 | 690 |
| 8 | 12.5% | 512 | 5,700 | 2,800 |
| 12 | 8.3% | 1,728 | 19,200 | 9,600 |
For example, a C / P of 5 means the equivalent load is 33 kN on this bearing. Use the Load Calculator to work out P for your actual radial and axial loads.
Equivalents of the 7224 BM from other brands
These parts share the main boundary dimensions of the 7224 BM and are commonly used as its equivalent. Published load ratings differ a little between makers because internal designs differ.
| Brand | Part | C (kN) | C0 (kN) | Dynamic rating vs SKF |
|---|---|---|---|---|
| SKF | 7224 BM | 165 | 163 | Reference |
| Timken | 7224 B | 165.4 | 161.4 | 100% of SKF |
Check clearance class, cage, seals and any special suffix before ordering. A matching main size does not guarantee the parts are interchangeable in every detail.
Where the 7224 BM is used
Angular-contact ball bearings are chosen for: Combined radial and axial load; precision/high-speed arrangements. Typical equipment: Pumps, compressors, spindles, generators, aerospace accessories. Often paired/preloaded; contact angle and lubrication matter.
Other sizes in the same series
The 7224 BM is size 23 of 31 in the Rotec AI catalogue for the “72 light” series. The next size down, the 7222 BEP, has a bore of 110 mm and a dynamic rating of 153 kN. The next size up, the 7226 BM, has a bore of 130 mm and a rating of 186 kN (+13%).
Common problems on bearings like the 7224 BM
Most field failures trace back to lubrication, contamination, fits and alignment rather than the bearing itself. These guides explain how to recognise and prevent them:
Questions about the 7224 BM
What are the dimensions of a 7224 BM bearing?
The 7224 BM has a bore of 120 mm and an outside diameter of 215 mm. It is a single-row angular contact ball bearing. Series: 72 light.
What is the load rating of a 7224 BM bearing?
In the Rotec AI catalogue the 7224 BM has a basic dynamic load rating C of 165 kN and a basic static load rating C0 of 163 kN. Always confirm against the manufacturer's current catalogue.
What is the equivalent of a 7224 BM bearing?
Equivalent parts include Timken 7224 B. Check clearance, cage and seal suffixes before substituting.